▎ 摘　　要

NOVELTY - Photodegradation catalyst comprises ceramic carrier which is loaded with titanium dioxide, composite metal ion and graphene. The composite metal ion comprises rare earth metal element ion, ferric ion and silver ion, where the added amount of rare earth metal element ion is 0.1-0.5 wt.% titanium dioxide, the added amount of ferric ion 0.1-0.5 wt.%, and the added amount of silver ion is 0.1-0.5 wt.%. USE - The photodegradation catalyst is useful for organic sewage treatment. ADVANTAGE - The photodegradation catalyst has shallow potential trap for photo-generated electron-hole pair, inhibits the recombination of electrons and holes, increases the inventory life of photo-generated electron-hole pairs, improves the photocatalytic activity of titanium dioxide, and compounding with graphene to increase the dispersion of titanium dioxide, increase the surface photosensitivity of titanium dioxide, and promotes photodegradability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the photodegradation catalyst, involving (i) placing ceramic carrier in an ultrasonic reactor and ultrasonically treating for 2-3 hours, and (ii) mixing titanium dioxide, rare earth metal element salt, ferric chloride, silver nitrate and anhydrous ethanol to obtain a colloidal solution, and mixing the colloidal solution with the ceramic carrier for ultrasonically treating, taking out, drying at 120-130 degrees C for 3-5 hours, and calcining at 380-640 degrees C for 3-5 hours to obtain the product.